cyassl 2.6.0: update formula

Since the CyaSSL formula was originally contributed to Homebrew, several of the configure options have changed case or polarity. These have been updated.

The formula was also enabling a couple options, bump and fortress, that aren't actual features. They bundle several other options for a couple specific applications. I left out the libz enable as the CyaSSL libz support is a custom behavior and not DEFLATE. (The compression flag in the TLS headers is set to a custom value. The headers aren't compressed.)